<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>响应式设计</title>
  <style>
    .city {
      float: left;
      margin: 5px;
      padding: 15px;
      width: 300px;
      height: 300px;
      border: 1px solid black;
    }
  </style>
</head>
<body>

<h1>W3School Demo</h1>
<h2>Resize this responsive page!</h2>
<br>

<div class="city">
  <h2>London</h2>
  <p>London is the capital city of England.</p>
  <p>It is the most populous city in the United Kingdom,
    with a metropolitan area of over 13 million inhabitants.</p>
</div>

<div class="city">
  <h2>Paris</h2>
  <p>Paris is the capital and most populous city of France.</p>
</div>

<div class="city">
  <h2>Tokyo</h2>
  <p>Tokyo is the capital of Japan, the center of the Greater Tokyo Area,
    and the most populous metropolitan area in the world.</p>
</div>

</body>
</html>